Richard Paap is professor of Econometrics at Econometric Institute, Erasmus University Rotterdam. He teaches in the bachelor and master programmes in Econometrics at the same university. His research has appeared in several economic, econometric and statistical journals, like Journal of Econometrics, Journal of Applied Econometrics and Journal of Business & Economic Statistics. Furthermore, he is co-author of two econometric textbooks Quantitative Models in Marketing Research and Periodic Time Series Analysis published by Cambridge University Press and Oxford University Press, respectively.